MAZDA MODEL MX-5 2014 (in English) Service Manual

Black plate (41,1)
Supplemental Restraint System Components
Driver/Passenger inflators and air bags
Crash sensor, and diagnostic module (SAS unit)
Seat belt pretensioner and load limiting systems (page 2-13)
Front air bag sensor
Side crash sensorsí
Air bag/seat belt pretensioner system warning light (page 2-32)
Side inflators and air bagsí
Passenger air bag deactivation indicator light (page 2-37)
Passenger seat weight sensors (page 2-37)
Passenger seat weight sensor control module
Driver and passenger seat belt buckle switches (page 2-40)
Driver seat slide position sensor (page 2-37)
Essential Safety Equipment
SRS Air Bags
2-29íSome models.
MX-5_8DG6-EA-13F_Edition1 Page41
Thursday, May 30 2013 10:49 AM
Form No.8DG6-EA-13F

Black plate (42,1)
How the SRS Air Bags Work
Your Mazda is equipped with the following types of SRS air bags. SRS air bags are
designed to work together with the seat belts to help to reduce injuries during an accident.
The SRS air bags are designed to provide further protection for passengers in addition to
the seat belt functions. Be sure to wear seat belts properly.
qSeat Belt Pretensioners
The seat belt pretensioners are designed to deploy in moderate or severe frontal, near
frontal collisions.
qDriver Air Bag
The driver's air bag is mounted in the steering wheel.
When air bag crash sensors detect a frontal impact of greater than moderate force, the
driver's air bag inflates quickly helping to reduce injury mainly to the driver's head or chest
caused by directly hitting the steering wheel.
For more details about air bag deployment, refer to “SRS Air Bag Deployment Criteria ”
(page 2-34).
The driver's dual-stage air bag controls air bag inflation in two energy stages. During an
impact of moderate severity the driver's air bag deploys with lesser energy, whereas during
more severe impacts, it deploys with more energy.
2-30
Essential Safety Equipment
SRS Air Bags
MX-5_8DG6-EA-13F_Edition1 Page42
Thursday, May 30 2013 10:49 AM
Form No.8DG6-EA-13F

Black plate (43,1)
qPassenger Air Bag
The passenger air bag is mounted in the passenger dashboard.
The inflation mechanism for the passenger air bag is the same as the driver's air bag, as
mentioned above.
For more details about air bag deployment, refer to “SRS Air Bag Deployment Criteria ”
(page 2-34).
In addition, the passenger air bag is designed to only deploy in accordance with the total
seated weight on the passenger seat. For details, refer to the driver and passenger occupant
classification system (page 2-37).
Essential Safety Equipment
SRS Air Bags
2-31
MX-5_8DG6-EA-13F_Edition1 Page43
Thursday, May 30 2013 10:49 AM
Form No.8DG6-EA-13F

Black plate (44,1)
qSide Air Bagsí
The side air bags are mounted in the outboard sides of the front seatbacks.
When the air bag crash sensors detect a side impact of greater than moderate force, the
system inflates the side air bag only on the side in which the vehicle was hit. The side air
bag inflates quickly to reduce injury to the driver or front passenger's chest caused by
directly hitting interior parts such as a door or window.
For more details about air bag deployment, refer to “SRS Air Bag Deployment Criteria ”
(page 2-34).
In addition, the front passenger side air bag is designed to only deploy in accordance with
the total seated weight on the front passenger seat. For details, refer to the driver and front
passenger occupant classification system (page 2-37).
q Air Bag/Seat Belt Pretensioner System Warning Light
If the air bag/seat belt pretensioner system is working properly, the warning light
illuminates when the ignition is switched ON or after the engine is cranked. The warning
light turns off after a specified period of time.
A system malfunction is indicated if the warning light constantly flashes, constantly
illuminates or does not illuminate at all when the ignition is switched ON. If any of these
occur, consult an Authorized Mazda Dealer as soon as possible. The system may not
operate in an accident.
2-32
Essential Safety Equipment
íSome models.
SRS Air Bags
MX-5_8DG6-EA-13F_Edition1 Page44
Thursday, May 30 2013 10:49 AM
Form No.8DG6-EA-13F

Black plate (45,1)
WARNING
Never tamper with the air bag/pretensioner systems and always have an Authorized
Mazda Dealer perform all servicing and repairs:Self-servicing or tampering with the systems is dangerous. An air bag/pretensioner
could accidentally activate or become disabled causing serious injury or death.
Essential Safety Equipment
SRS Air Bags
2-33
MX-5_8DG6-EA-13F_Edition1 Page45
Thursday, May 30 2013 10:49 AM
Form No.8DG6-EA-13F

Black plate (46,1)
SRS Air Bag Deployment Criteria
This chart indicates the applicable SRS equipment that will deploy depending on the type
of collision.
(The illustrations are the representative cases of collisions.)
SRS
equipment Types of collision
A severe frontal/near frontal collision A severe side collision A rear collision
Seat belt
pretensioner X*1(both sides)
No air bag and front seat
belt pretensioner will be
activated in a rear collision.
Driver air
bag X
Passenger air bag X
*1
Side air
bagíX*1(impact side only)
X: The SRS air bag equipment is designed to deploy in a collision.
*1: The passenger front and side air bags and the seat belt pretensioner are designed to deploy depending on the condition of the total seated weight on the passenger seat.
2-34
Essential Safety Equipment
íSome models.
SRS Air Bags
MX-5_8DG6-EA-13F_Edition1 Page46
Thursday, May 30 2013 10:49 AM
Form No.8DG6-EA-13F

Black plate (47,1)
Limitations to SRS Air Bag
In severe collisions such as those described previously in“SRS Air Bag Deployment
Criteria ”, the applicable SRS air bag equipment will deploy. However, in some accidents,
the equipment may not deploy depending on the type of collision and its severity.
Limitations to front/near front collision detection:
The following illustrations are examples of front/near front collisions that may not be
detected as severe enough to deploy the SRS air bag equipment.
Impacts involving trees or poles Frontal offset impact to the vehicle
Rear-ending or running under a truck’s tail gate
Limitations to side collision detection:
The following illustrations are examples of side collisions that may not be detected as
severe enough to deploy the SRS air bag equipment.
Side impacts involving trees or polesSide impacts with two-wheeled vehicles
Essential Safety Equipment
SRS Air Bags
2-35
MX-5_8DG6-EA-13F_Edition1 Page47
Thursday, May 30 2013 10:49 AM
Form No.8DG6-EA-13F

Black plate (48,1)
Roll-over
2-36
Essential Safety Equipment
SRS Air Bags
MX-5_8DG6-EA-13F_Edition1 Page48
Thursday, May 30 2013 10:49 AM
Form No.8DG6-EA-13F

Black plate (49,1)
Driver and Passenger Occupant Classification System
First, please read“Supplemental Restraint System (SRS) Precautions ”(page 2-25)
carefully.
q Driver Seat Slide Position Sensor
Your vehicle is equipped with a driver seat slide position sensor as a part of the
supplemental restraint system. The sensor is located under the driver seat. The sensor
determines whether the driver seat is fore or aft of a reference position and sends the seat
position to the diagnostic module (SAS unit). The SAS unit is designed to control the
deployment of the driver air bag depending on how close the driver seat is to the steering
wheel.
The air bag/seat belt pretensioner system warning light flashes if the sensor has a possible
malfunction (page 2-32).
qPassenger Seat Weight Sensors
Your vehicle is equipped with a passenger seat weight sensors as a part of the supplemental
restraint system. These sensors are located under both of the passenger seat rails. These
sensors determine the total seated weight on the passenger seat and monitor the seat belt
buckle for the passenger seat. The SAS unit is designed to prevent the passenger front and
side air bags and seat belt pretensioner system from deploying if the passenger air bag
deactivation indicator light illuminates.
To reduce the chance of injuries caused by deployment of the passenger air bag, the system
deactivates the passenger front and side air bags and also the seat belt pretensioner system
when the passenger air bag deactivation indicator light illuminates. Refer to the following
table for the passenger air bag deactivation indicator light illumination conditions.
This system shuts off the passenger front and side air bags and seat belt pretensioner
system, so make sure the passenger air bag deactivation indicator light illuminates
according to the following table.
The air bag seat belt pretensioner system warning light flashes and the passenger air bag
deactivation indicator light illuminates if the sensors have a possible malfunction. If this
happens, the passenger front and side air bags and seat belt pretensioner system will not
deploy.
Essential Safety Equipment
SRS Air Bags
2-37
MX-5_8DG6-EA-13F_Edition1 Page49
Thursday, May 30 2013 10:49 AM
Form No.8DG6-EA-13F

Black plate (50,1)
Passenger air bag deactivation indicator light
This indicator light illuminates to remind you that the passenger front and side air bags and
seat belt pretensioner will not deploy during a collision.
If the passenger weight sensors are normal, the indicator light illuminates when the ignition
is switched ON. The light turns off after a few seconds.
The passenger air bag deactivation indicator light illuminates or is off under the following conditions:Condition detected by the passenger occupant
classification system Passenger air bag
deactivation indicator light Passenger front and side
air bags Passenger seat belt
pretensioner system
Empty (Not occupied)
*1Off Deactivated Deactivated
Child or child-restraint
system
*2On Deactivated Deactivated
Adult
*3Off ReadyReady
*1 : If the passenger seat belt is buckled, the passenger air bag deactivation indicator light illuminates, however this does not indicate a malfunction.
*2 : If a larger child sits on the passenger seat, the sensors might detect the child as being an adult depending on the child's physique.
*3 : If a smaller adult sits on the passenger seat, the sensors might detect the person as being a child depending on
the person's physique.
If the passenger air bag deactivation indicator light does not illuminate when the ignition is
switched ON and does not illuminate as indicated in the above chart, do not allow a child
to sit in the passenger seat and consult an Authorized Mazda Dealer as soon as possible.
The system may not work properly in an accident.
2-38
Essential Safety Equipment
SRS Air Bags
MX-5_8DG6-EA-13F_Edition1 Page50
Thursday, May 30 2013 10:49 AM
Form No.8DG6-EA-13F